Insulator device



NOV. 7, 1933. v PETTMAN r AL 1,934,557

INSULATOR DEVICE Filed Sept. 27, 1952 Patented Nov. 7, 1933 UNITED STATES PATENT OFFICE,

INSULATOR DEVICE Albert V inten Pettman and William Reed-Lethbridge, Auckland, New Zealand Application September 27, 1932, Serial No. 635,116, and in New Zealand December 19,

10 Claims. (Cl. 173-28) cipalobject of the invention being to provide that the insulator will remain dry under all conditions.

Hitherto it has been found that insulators accumulate water or a film of moisture or dirt over their entire surface in wet weather, and, in the case of wireless installations, bringing about extraneous noises in the receiver.

An object, therefore, of thepresent invention is to provide, in a wireless installation, a better insulation resulting in a greater efliciency to the 5 receiving set and eliminating a great majority of the noises caused by imperfect insulation.

A further object is to provide for a lightning arrester combined with the insulator device.

According to the present invention, a housing is provided for the insulator, consisting of a central chamber wherein is placed an ordinary or specially designed insulator having rods extending outwardly through the chamber, and by means of these rods the aerialor other con- 5 ductor is suspended. On each end of the central chamber are formed end chambers over the outer ends of which fit capping pieces fixed to the rods so that the housing may rotate inde-- pendently of the capping pieces which exclude the Water from the chambers.

The invention will be described with the aid of the accompanying drawing, wherein:

Figure l is a sectional elevation of the device. Figure 2 is a sectional plan on line A-A Fig-- ure 1.

Figure 3 is another view of the insulator. Figure 4 is a sectional plan on line B--B Figure 1. Figure 5 is a perspective of a lightning arrester. Referring to the drawing, the insulator 1 of glass or the like is held by rods 2 and 3 separated from each other as will be hereinafter described. The rods 2 and 3 extend in opposite directions and are attached to the aerial wiring or conductor and to the usual suspending wires or supports for the aerial or other conductor by the rings 4 and 5. The housing or protective cover consists of a central chamber 6 and end chambers 7 and 8. These are conveniently formed by cylindrical sections 9 and 10 secured together midway by means of a threaded joint 11, while their outer ends converge conically, as shown, with an opening 12 through which the rods freely pass. About midway in their length, each section has a dividing wall 14, also having a central opening through which the rods pass. These walls divide the housing into the central chamber 6 and the end chambers '7 and 8. The rods are retained in position against the dividing walls 14 by means of shoulders' 15 formed on the rods, thus retaining the insulator in position within the central chamber. Caps 16 with conically tapered ends are secured on the rods 2 and 3 by means of nuts 5 l8 and these caps project over the conical ends of the sections 9 and 10 as shown. Further caps or cylindrical extensions 19 with conically tapered ends pass over the caps 16 fitting tightly onthe sections 9 and 10 against the shoulders 20 and 7 contain drainage holes 21. The sections 9 and 1,0 are formed of suitable insulating material such as glass.

The rods pass through the walls 14 so that the sections 9 and 10 are rotatable thereon, the housing being thus free to rotate axially on the rods. i In the case of the device being used in suspending a horizontal or nearly horizontal aerial or other conductor, a weight 22 is attached by a band 23, located midway in the length of the device, on the same side as the drainage holes 21 in the caps 19 to ensure that the housing will rotate and remain in a position with the drainage holes'21 on the lower side. In this case, water or moisture driven or finding its way into the ends of the conically 8 ended caps19 will flow to the bottom side of thecaps 19 and pass out'through the drainage holes, being prevented from entering the openings 12 by the caps 16.

Discs 24 secured on the rods within the end chambers assist in preventing any moisture, which: may have accumulated on the rods where they pass through the end chambers, from passing to the central chamber. The discs are passed through the opening 12 and secured on the rods after the sections 9 and 10 are in position. 3

When the device is used on an aerial in a vertical or sloping position, the weight 22 is not required, nor is the cap 19 on the upper end of the device required, the caps 16.01; the upper end preventing water from entering the end chamher 7.

The insulator 1 is held between the rods 2 and 3 by means of U straps 25 and 26, which have their ends passing through flanges 27 and 28 respectively on the ends of the rods 2 and 3. The straps pass through slots 29 in the ends of the insulator and are set sufficiently deep so that the straps will not come into contact with the flanges 27 and 28. I

i so,

Around the strap 25 within the groove of the insulator 1, is placed a U shaped metal piece 30, of such a dimension that when the straps 25 and 26 are in position, a small gap 31 is left between the ends of the U piece 30 and the flange 28, thus acting as a lightning arrester, since one of the rods is connected to earth and the other rod is connected to the aerial or other conductor.

What we claim is:-

1. In insulator devices for electric conductors and the like, an insulator, rods to which said insulator is connected, the end of said rods respectively connected to the suspending means of the conductor and to the conductor, a housing surrounding said insulator and rotatable on said rods, with means at the ends of said housing to prevent water passing into said housing.

2. In the device as claimed in claim 1, said housing consisting of two cylindrical parts having conical shaped ends and threaded together at their centre, a dividing wall in each part through which said rods pass and support the insulator, and caps on the rods extending over the conical ends to prevent the entry of water therein, substantially as described.

3. In insulating devices for electric conductors and the like, an insulator, rods extending from opposite ends of said insulator, a central chamber wherein said insulator is contained, end walls for said central chamber in which said rods axially pass whereby said chamber can rotate thereon, chambers at each end of said central chamber through which said rods also pass, and means attached to said rods for preventing the entry of water into the outer ends of said chambers, substantially as described.

4. In insulating devices for wireless and the like, an insulator, rods extending from opposite ends of said insulator, a central chamber wherein said insulator is contained, end walls for said central chamber through which said rods are passed, whereby said chamber is free to rotate on the rods, and chambers at each end of said central chamber through which said rods also pass, said chambers insulated from said rods, and means attached to said rods for preventing the entry of water into said chambers, and means whereby the chambers may rotate independently of the insulator and rods.

5. In the device claimed in claim 4, caps fitting over the outer ends of said end chambers and having drainage holes therein, and means whereby when the insulator device is in a horizontal position the device is retained in such a position that the drainage holes are on the lower side thereof, substantially as described.

6. In the device as claimed in claim 3, the chambers formed of insulating material such as glass in two portions and threaded together at their centre.

'1. In the device as claimed in claim 4, a housing in which said chambers are formed, a weight secured on said housing to retain the device in the required axial position.

8. In insulating devices for electric conductors and the like, an insulator and rods extending from opposite ends of the insulator, a housing of non-conducting material enclosing the insulator and rotatable on the rods with the outer parts of rods projecting beyond the ends of the housing, and a cap mounted on the outer part of each rod and extending over the adjacent end of the housing and with the rim of the cap slightly spaced from the housing.

9. In insulating devices for electric conductors and the like, an insulator and rods extending from opposite ends of the insulator, a cylindrical housing of non-conducting material enclosing the insulator and rotatable on the rods, said housing having conical ends through which the rods extend, and a conical cap mounted on the outer part of each rod and extending over,

the adjacent conical end of the housing with the rim of the cap spaced from the conical end of the housing.

10. In insulating devices for electric conductors and the like, an insulator, rods extending. from opposite ends of said insulator, a cylindrical housing of non-conducting material enclosing the insulator and having conical ends extending over the inner parts of the rods and with the outer end parts of the rods projecting through the conical ends of the housing, a conical cap of less diameter than the cylindrical housing mounted on the outer part of each rod and extending over the conical end of the housing with the rim of the cap spaced slightly from the conical end.

of the housing, and a cylindrical extension mounted on each'end of the cylindrical housing and having a conical outer part extending over the adjacent conical cap in spaced relation thereto, said cylindrical extension having a drainage opening through its wall.

ALBERT VINTEN PETTMAN. WILLIAM REED-LETHBRIDGE. 

